To help kids remember the directions, over, under, on, to the left/right of, etc, you can have the group build something all together. Get a big pile of blocks for this activity.
Line the kids up and have each one take a block. The first one will place the block and say "On the table." Each one with then place their block and state where the block is: "On the red block" "under the green arch" "to the right of Joey's block."